參數(shù)資料
型號(hào)： XR16V2750IL-0B-EB
廠商： Exar Corporation
文件頁(yè)數(shù)： 50/52頁(yè)
文件大?。?/td> 0K
描述： EVAL BOARD FOR V2750 32QFN
標(biāo)準(zhǔn)包裝： 1
系列： *
XR16V2750
7
REV. 1.0.3
HIGH PERFORMANCE DUART WITH 64-BYTE FIFO
1.0
PRODUCT DESCRIPTION
The XR16V2750 (V2750) integrates the functions of 2 enhanced 16C550 Universal Asynchronous Receiver
and Transmitter (UART). Each UART is independently controlled having its own set of device configuration
registers. The configuration registers set is 16550 UART compatible for control, status and data transfer.
Additionally, each UART channel has 64-bytes of transmit and receive FIFOs, automatic RTS/CTS hardware
flow control with hysteresis control, automatic Xon/Xoff and special character software flow control,
programmable transmit and receive FIFO trigger levels, FIFO level counters, infrared encoder and decoder
(IrDA ver 1.0), programmable fractional baud rate generator with a prescaler of divide by 1 or 4, and data rate
up to 8 Mbps with 8X sampling clock rate or 4 Mbps in the 16X rate. The XR16V2750 is a 2.25 to 3.6V device
with 5 volt tolerant inputs. The V2750 is fabricated with an advanced CMOS process.
Enhanced Features
The V2750 DUART provides a solution that supports 64 bytes of transmit and receive FIFO memory, instead of
16 bytes in the ST16C2550 or one byte in the ST16C2450. The V2750 is designed to work with low supply
voltage and high performance data communication systems, that require fast data processing time. Increased
performance is realized in the V2750 by the larger transmit and receive FIFOs, FIFO trigger level control, FIFO
level counters and automatic flow control mechanism. This allows the external processor to handle more
networking tasks within a given time. For example, the ST16C2550 with a 16 byte FIFO, unloads 16 bytes of
receive data in 1.53 ms (This example uses a character length of 11 bits, including start/stop bits at 115.2
Kbps). This means the external CPU will have to service the receive FIFO at 1.53 ms intervals. However with
the 64 byte FIFO in the V2750, the data buffer will not require unloading/loading for 6.1 ms. This increases the
service interval giving the external CPU additional time for other applications and reducing the overall UART
interrupt servicing time. In addition, the programmable FIFO level trigger interrupt and automatic hardware/
software flow control is uniquely provided for maximum data throughput performance especially when
operating in a multi-channel system. The combination of the above greatly reduces the CPU’s bandwidth
requirement, increases performance, and reduces power consumption.
The V2750 supports a half-duplex output direction control signaling pin, RTS# A/B, to enable and disable the
external RS-485 transceiver operation. It automatically switches the logic state of the output pin to the receive
state after the last stop-bit of the last character has been shifted out of the transmitter. After receiving, the logic
state of the output pin switches back to the transmit state when a data byte is loaded in the transmitter. The
auto RS-485 direction control pin is not activated after reset. To activate the direction control function, user has
to set FCTR Bit-3 to “1”. This pin is normally high for receive state, low for transmit state.
Data Rate
The V2750 is capable of operation up to 4 Mbps at 3.3V with 16X internal sampling clock rate and 8 Mbps at
3.3V with 8X sampling clock rate. The device can operate with an external 24 MHz crystal at 2.5V on pins
XTAL1 and XTAL2, or external clock source of up to 64 MHz on XTAL1 pin. With a typical crystal of 14.7456
MHz and through a software option, the user can set the prescaler bit for data rates of up to 1.84 Mbps.
The rich feature set of the V2750 is available through the internal registers. Automatic hardware/software flow
control, selectable transmit and receive FIFO trigger levels, selectable TX and RX baud rates, infrared
encoder/decoder interface, modem interface controls, and a sleep mode are all standard features.
Following a power on reset or an external reset, the V2750 is software compatible with previous generation of
UARTs, 16C450, 16C550 and 16C650A as well as the 16C850.
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